Well devices



" J. v. FREDD I WELL'DEVICES Jan. 12, 1960 3 Sheets-Sheet 1 Filed April8, 1957 INVEILJTOR John V. Fred'd IIII I ATTORNEY Jan; 12, 1960J.V.FREDD 2,920,704

' WELL DEVICES Filed April 8. 1957 3 Sheets-Sheet 2 W/AV/ H H4 I I31 53\122 122 2 n7 9 v Q ua I20 F lg. 6

Fig.7

INVENTOR John V. Frevdd ATTORNEY Fig.8 Fig.9

J. v. FRE'DD 2,920,704 WELL DEVICES Jan, 12, 1960 Filed April 8, 1957INVENTOR John V. Fredd ATTORNEY 3 Sheets-Sheet 3 Un ed States Par o WELLDEVICES John v. Fredd, Dallas, Tex assignor to Otis EngineeringCorporation, Dallas, Tex., a corporation of Texas vApplication April'8,.1957, Serial No. 651,440 I I 8 Claims. on 166-125 This invention relatesto new and useful improvements in well devices. i I e I One object ofthe invention is to provide a new and improved anchoring device adaptedfor use in a well how conductor to support subsurface well'devices inpredetermined position in said well flow conductor.

An important object is to provide an anchoring device having lockingmeans thereon which are positively held in locking position by a membermovable longitudinally.

into position to engage said locking means to positively holdsaidlocking means in locking position, and wherein means is provided forreleasably positively restraining or looking said member in suchposition to prevent unde sired or accidental release of said lockingmeans.

'Another object is to provide, in an anchoring dev ce of the characterdescribed, resilient means for holding the actuating member in positionto hold the locking means in lockingposition, said actuating memberbeing movable from such position upon the application of a predeterminedupward force thereto..

Additional objects and advantages of the invention will be readilyapparent from the reading of the followf ingdescription of devicesconstructed in accordance with the invention, and referenc'e'to theaccompanying draw ings thereof, wherein: 1 v r p Figure 1 is a viewpartly in elevation and partly in section of one form of theanchoringdevice, showing the same locked in position in a landing nippleforming a section of a well flow conductor;

Figure 2 is a sectional view taken on the line of.

Figure l; c

Figure 3 is a sectional view Figure 1;

taken on the line 3+3 of .Figure 4 is an enlarged-fragmentary 'view,partly section, of the upper portion of the anchoring device of Figure1;

Figure 5 1s a perspective view of one of thelocking elements of theanchoring device;

Figure 6 is an enlarged fragmentary sectional view showing the dogexpander and dog holder of the anchoring device in non-locking positionwherein the locking elements are free to move to retracted position; I

Figure 6a is. an enlarged view of. thedog expander and dog holder of thelockingdevice of Figures. 1 through 6--and showing the same with alockingdogpositioned in operative relationship with respect to the dogholder portion of the member: I

Figure6b is a view similar to Figures 6 and 7, showing the dog expanderand dogholder being moved from upper non-locking position'downwardlytoward lo'cking positionf Figure 7 is a view simi-larto Figure 6 andshowing the dog expander and dog holder in inter-locked position inwhich the dog expander holds the locking elements in locking position; IY

Figure 8 is a view, partly in section and partly in elevation, of amodified form of anchoring device, showing tween. the lower mandrelsection andits adjacent..key,

and an outturned end portion. 28 which projects intoa.

the same unlocked positioni'na landinginipple form; ing a section of aWell flow conductor, and

Figure 9 is aview similar toFigure 8, taken at right:

angles to Figure 8 and showing the anchoring device in;

the locked position.

This application is" Referring a lower section 12, and a central bore13. The lower end portion 14 of the upper mandrel section is'enlarged:and internally threaded tolreceive t he upper threaded end portion ofthe lower mandrel section. A positioning or} locating assembly ismounted [on the lowermandrel see- 1 tion andlincludes a key carrier .IS'and a plurality iof. selector keys16. The. key carrier compriseslapairof spaced annular members 17 joined, by a pair of internal; connectingribs18 and. 19,,the lower annular surfaceflfi of the lower,annularmernber rresting on the annular.

shoulder 21 of the lower mandrel section.

,Theannular members. 17 of the keyQarner have aplusrality of opposedvertical guideslots 2.2 in which are received the studs or guides 23 ofthe selector keys.16,,;

the guides and guide slots cooperating to permit outward and. inwardmovement of the. selector keysperpendicular to the longitudinal axis. ofthe mandrelinto expanded, and'retractedpositions, v, The select-orkeysare biased outwardly by. springs. 24,. each having an innercurvedportion 25 which bears against a. reduced. portion or outer,groove 26of the lower mandrel. section, va bight, portion. 27 disposedbelateral aperture 29 of the key. It,,will be apparent that thespringsurge or. biasthe keys outwardlyaway from the mandrel, and thatspriugsflof. otherforms than thatshown may be employed for-the purpose,

Each key is provided with an internal groove orrecess 30 which ispositioned .in aligned relation with the outer, groove 26 of the lowerrnandrel section,v andthe spring; 24 is disposed in. and between thesetwo grooves. The, two grooves are formed in the lower mandrel sectionand.

inithe keys to provide sufiicient operatingfroom for. the springs.

The upper and lower ends. of the keys. are provided. with inwardlybeveled surfaces 31.and 32 which tend. to

. cam the keys inwardly when they. come into contact-withobstructions astheanchoring device isgmovedthrouglra1 wellflowcond uctora p I v Each ofthe keys is also provided-with an external groove. 33 which forms adownwardly facing stop shoul-.. der 34extending substantiallyperpendicularly to, the lonegitudinal axis of the. mandrel andabevieledor tapered in a'particular landing nipple 40 connected in awell flow conductor or string.

The key groove 38 of annular upwardly facing shoulder il whichisJaldapted to be engaged by the downwardly facing'stop shoulders 34 i vPatented- 122,175.

a continuation-in-part of pending applications, Serial No. 346,97 4,filed Aprilfd," 1.953, now United States Letters Patent No, 2,798,559,issued July 9, 1957, and Serial No 385,2 48,filed October now to thedrawings, particularly id lthrough 7, the numeral 10 designates an"elongate man drel'orcarrier -member comprising an upper sectionf ll,

the landing nipple defines an" of the keys when they are in expandedposition to stop further downward movement of the anchoring devicethrough the landing nipple. The beveled surface of the boss portion andthe beveled surface 31 of the key portion of the keys are adapted to camthe keys inwardly by engagement with the annular beveled surfaces 42 and43, defined by the internal key grooves 39 and 38 of the landing nipple,when the anchoring device is moved upwardly in the landing nipple. Itwill thus be seen that the keys serve to stop or limit downward movementof the anchoring device through the well flow conductor but permitupward movement of the device.

Each of the keys is provided with a plurality of lateral ports 44 aswell as the lateral aperture 29 and an inwardly and upwardly extendingflow or drain aperture 45a.

In order to lock the anchoring device in such predetermined positionagainst upward movement, a plurality of expansible locking members ordogs 45 are mounted on the upper mandrel section for movement into anannular internal locking groove 46 provided in the landing nipple 49.The dogs have hooks 47 at their upper ends which extend into an annulargroove 48 in a tubular dog holder 49, which is threaded at its lower endportion onto the externally threaded enlarged portion 14 of the uppermandrel section 11 to form a part of the carrier member. The dog holderis provided with a plurality of longitudinally extendingcircumferentially spaced slots 50 in which are disposed outwardlyextending bosses 51 of the dogs 45. The lower end portions of the slots50 are defined by end surfaces 52 which are aligned with the annularstop surface 53 formed by the enlarged portion 14 of the upper mandrelsection.

The bosses 51 of the dogs have downwardly and inwardly extending beveledcamming surfaces or shoulders 54 which are engaged by upwardly andoutwardly beveled lower surfaces 55 on the lower end portion of a dogexpander 56. The dog expander has an upper tubular sleeve portion 57slidably mounted on the upper mandrel section and a lower enlargedsplit'or collet portion 58 having slots 59 in which the shanks 60 of thedogs are disposed.

The collet portion has an enlarged lower locking portion 61 whichprovides upwardly facing outwardly and downwardly inclined or beveledshoulders 62 adapted to engage the internal annular shoulder 63 in thebore of the dog holder to limit upward longitudinal movement of the dogexpander relative to the mandrel and the dog holder. The dogs are movedto expanded positions when the dog expander is moved downwardly on theupper mandrelsection to the position shown in Figure l.

A- packing assembly 64 is mounted on the lower mandrel section above theupper annular member 17 of the key. carrier to seal between the mandreland the well flow conductor. The packing assembly is confined betweenthe upper end 65 of the upper annular member 17 and the lower annularsurface 66 formed by the extreme lower enlarged portion 67 of the uppermandrel section.

The dog holder 49 is provided with an arcuate inwardly extendingprojection or detent member 68 which is adapted to engage in the arcuategrooves or recesses 69 in the outer locking surfaces of the lower colletportion 58 of the dog expander. The dog expander is formed of metal sothat the collet portion 58 thereof may be flexed slightly inwardly bythe arcuate projections as the lower end of said expander is moveddownwardly in the dog holder from the position shown in Figure 6 to theposition shown in Figure 7, and then outwardly when the arcuate recesses69 become aligned with the arcuate projection 68. There is suficientspace between the inner surfaces 70 of the collet portion of the dogexpander and the external surface of the upper section 11 of the mandrelto permit said collet portion to flex inwardly slightly so the detent orprojection may engage in the recesses of the locking surfaces.

The projection 68 and the arcuate recesses 69 cooperate to releasablyhold or lock the dog expander to the dog holder to prevent accidentalupward displacement of the dog expander relative to the dogs. Since boththe recesses and the projection are arcuate in form, a relatively strongupward pull exerted on the dog expander will cause the collet portions58 to be camrned inwardly to disengage said collet portions from thearcuate projections and permit upward movement of the dog expander. Ofcourse, the dog expander could be provided with arcuate projectionsinstead of recesses, in which case the dog holder would be provided witha corresponding arcuate recess.

The anchoring device is lowered intoa well conductor by a running tool(not shown) similar to that disclosed in my copending application SerialNo. 346,974, said running tool being secured to an outwardly extendingflange 71 at the upper end of the dog expander by means of shear pins(not shown) extending through the parallel tangential grooves 72 and 73provided on opposite sides of said flange. The flange is undercut toprovide an upwardly and inwardly inclined surface 74 which may beengaged by a suitable fishing tool.

A well device, such as a length of extension tubing 75, may be securedto the threaded lower end of the lower mandrel section 12.

The anchoring device is supported by the running tool in the mannerdescribed in my co-pending application Serial No. 346,974, so that thedog expander 56 in turn supports the mandrel 10 by the engagement of itsshoulders 62 with the annular shoulder 63 in the bore of the dog holder49. In this uppermost position of the dog expander, the enlarged portion61 of the dog expander is disposed above the bosses 51 of the dogs, andthe dogs are free to remain in their retracted position.

The running tool, the anchoring device and the tubing extension are thenlowered into the well flow conductor by means of a flexible line or thelike, in the usual manner. The keys 16 are in their retracted positionsbut are biased outwardly to contact the inner walls of the well fluidconductor. The beveled surfaces 32 at the lower ends of the keys insurethat the keys will be camrned inwardly whenever they encounter anyobstructions, such as the ends of pipe sections, in the well fluidconductor during downward movement of the anchoring device.

When the anchoring device moves downwardly into the landing nipple 40having the key grooves 38 and 39 corresponding to the keys 16 of saiddevice, said keys are moved outwardly into said grooves, and the stopshoulders 34 of the keys abut the annular shoulder 41 of the landingnipple. This engagement of the stop shoulders 34 with the annularshoulder 41 prevents further downward movement of the anchoring deviceand thus positions and supports said device in a predetermined positionin the well flow conductor, the weight of the anchoring device and theextension tubing now being supported not by the flexible line but byengagement of the key stop shoulders with the annular shoulder 41.

The anchoring device, however, is still free to move upwardly since thedogs 45, whose bosses 51 are now aligned with the locking groove 46 ofthe landing nipple,

are in their retracted positions. Downward jarring blows impartedthrough the flexible line operating mechanism to the dog expander causesaid expander to move downwardly relative to the mandrel, the dog holderand the dogs. During this downward movement of the dog expander, thebeveled surface 55 at the lower end of the dog expander engages thecorresponding beveled shoulders or surfaces 54 of the dogs, causing saiddogs to pivot outwardly about their hooks 47 so that the bosses 51extend into the locking groove 46 of the landing nipple. The lockingportion 61 of the collet portion of the expander then engages the inneror rear surfaces 54a of the bosses of the dogs to positively hold thebosses in looking position in the locking groove.

As the dog expander moves further downwardly in in expanded position andthe dog expander is releasably restrained or held in position in the dogholder against accidental upward displacement therefrom.

The running tool is released from the anchoring de- 1 vice by shearingthe shearable pins which attach said running tool to said anchoringdevice in the manner as set forth in my co-pending application SerialNo. 346,974, now Patent No. 2,798,559, and the running tool is thenremoved upwardly from the well flow conductor by means of the flexibleline, the anchoring device supporting and holding the depending welldevice in position in the well. As pointed out in my co-pendingapplication, the shearable pins attaching the running tool to theanchoring device are sheared by downward jarring blows so that no upwardforce need be exerted on said anchoring device while said device isbeing installed and locked in position.

When it is desired to remove the anchoring device from the well tubing,any suitable retrieving or pulling tool (not shown) is lowered throughthe well flow conductor to engage the surface 74 of the flange 71 on theupper end of the dog expander. An abrupt upward pull exerted on theupper end of the dog expander causes the lower collet portion to becammed inwardly by the projection 68 in the dog holder, whereby thearcuate recesses 69 in the dog expander are disengaged from saidprojection. The dog expander is then moved upwardly relative to the dogsand the dog holder to position the enlarged locking portion 61 above theinner surfaces 54a of the bosses of the dogs so that said dogs will befree-to move into their retracted position. Further upward movement ofthe dog expander causes the shoulder 62 to engage the downwardly facingannular surface 63 of the dog holder so that continued upward movementof the fishing tool causes an upward pull to be exerted on the dogholder and therefore on the mandrel. As the 'dogs are moved upwardly bythe dog holder, their downwardly and outwardly inclined upper surfaces76 engage the correspondingly inclined surface 77 of the locking groove46 to cam said dogs inwardly. At the same time, the beveled uppersurfaces 31 and 35 of the keys engage the beveled annular surfaces 43and 42, respectively, of the landing nipple to cam said keys inwardly toretracted position. The'anchoring device and the attached extensiontubing 75 can then be lifted from the well.

It will be seen that an anchoring device has been shown and describedwhich includes a mandrel provided with a plurality of locking dogsmovable into expanded locked positions to prevent movement of themandrel in either upward or downward direction from the selectedposition, and a dog expander which moves the dogs into and locks them inexpanded positions on downward movement of said expander relative to themandrel, and wherein means has been provided on the dog expander and onthe dog holder for rel-easably positively holding said dog expander insuch locking position. It will be seen that the dog expander isreleasable from its lower locking position upon application of asufficient upward force thereto and that the dogs are thereby releasedfor inward movement from expanded to retracted positions. t

A modified form of the anchoring device is shown in Figures 8 and 9,which includes an elongate tubular body 110 provided with a pair oflaterally opposed longitudinal windows or key slots 111 through which a:pair of locking members, locking lugs or keys 112 extend. Each key hasat its opposite ends lateral projections or wings 113 which are adaptedto engage and bear against the inner walls of the body to limit outwardmovement of the keys. Each key is biased outwardly by a pair of springs114 Whose central bight portions 115 bear against the keys, whoselaterally spaced bent portions 116 are disposed in recesses 117 formedin the body on each side of the key slots, and whose ends 118 arereceived and held in suitable catch holes 119 in the wall of the body.On the lower end of each of the keys is a guide boss 120 havingoutwardly convergent beveled upper and lower shoulders, and an elongateselector and stop boss 121 is formed on each key above the guide bossand provides a downwardly facing stop shoulder 122 at the lower end ofsaid stop boss.

A tubular lock mandrel or inner member 123 is slidabl-e in the stop bodyand is secured in an upper nonlocking position in said stop body by ashear pin 124. The lock mandrel has a pair of opposed longitudinallyextending Windows 125 which receive internal projections 126 on theupper ends of the keys for a purpose to be more fully hereinafterdescribed.

In use, the anchoring device is lowered into a tubing string by means ofany suitable running tool (not shown) which engages the flange 127 onthe upper end of the lock mandrel. The keys 112 are free to moveinwardly against the outward force of the springs 114 whenever the guidebosses encounter any obstructions in the tubing string, the lowerbeveled shoulders of said bosses camming the keys inwardly on meetingsuch obstructions.

When the anchoring device reaches the landing nipple 128 connected tothe lower end of the tubing string, the guide boss moves past aninternal stop flange 129 in the bore of the landing nipple, but thedownwardly facing stop shoulder 122 of the stop boss of the key engagesthe undercut upper shoulder 130 of the stop. flange, thereby stoppingdownward movement of the anchoring device.

Downward jarring blows are then delivered to the lock mandrel by meansof the usual flexible line operated tool (not shown) to which therunning tool is attached to shear the pin 124 and move said lock mandreldownwardly in the body 110. The lower end portion of the lock mandrel isprovided on opposite sides with flattened surfaces 131 below the windows125, and when moved sufliciently downwardly said flattened surfaces arepositioned between and disposed to engage internal lock surfaces 132 onthe lower portions of the keys and thus positively hold said keys inexpanded positions. A beveled annular shoulder 133 on the lower end ofthe lock mandrel and similarly beveled shoulders 134 at the upper endsof the lock surfaces of the keys cooperate to positively move said keysfully outwardly if for any reason said keys have not previously beenmoved to fully expanded positions by the springs 114. Downward movementof the lock mandrel in the body is limited by the engagement of theupper ends 125:; of the windows in the mandrel with the internalprojections 126 on the upper ends of the keys.

An external annular arcuate lock recess or groove 135 is formed in thelower portion of the lock mandrel below the windows 125. A lock plunger,latch or detent 136 having a rounded nose 137 is attached at its rearend as by riveting 138 to a leaf spring 139, and said plunger isinserted through a hole in the wall of the body, the spring beingretained in a longitudinal external recess 140 in the body wall by meansof the countersunk screws 141 through its upper end.

The rounded nose of the plunger or detent protrudes into the bore of thebody whereby, as the lock mandrel is moved downwardly in said body tolocking position, the detent is cammed outwardly by the beveled annularshoulder 133 at the lower end of said lock mandrel. The

nose of the detent enters the groove 135 under the biasing force of theleaf spring when the lock mandrel has moved to its lower position in thebody, and releasably restrains or holds said lock mandrel in such lowerposition to prevent undesired or accidental retraction of the lockingkeys from locking position. The lower surface of annular groove 135 inthe lock mandrel is so inclined or curved downwardly that the detent maybe cammed outwardly from its engagement with said groove when asufiicient upward pull is exerted on the lock mandrel, but the lockmandrel is effectively held in its locking position until saidsuificient upward force is exerted thereon.

The anchoring device is thus locked in position in the landing nipple bythe lock mandrel and the locking keys, and neither an upward nor adownward force acting on the body can dislodge it. Further the lockmandrel is held in locking position by the detent 136 and the groove 135against accidental upward movement from locking position. The runningtool is then disengaged from the lock mandrel by downward jarring and isremoved from the tubing string, leaving the anchoring device in positionin said tubing string. It will be noted that the lock mandrel is tubularwhereby the flow of gases and liquids through the tubing string is notsubstantially restricted by the anchoring device.

Manifestly, the landing nipple 128 could be connected in the tubingstring at a point spaced from the lower end of said tubing string, ifdesired. Further it will be noted that any desired well tool such as atemperature or pressure recorder or the like may be attached to theanchoring device, by threads 142 at the lower end of the body, forsuspension in the well.

When it is desired to remove this form of anchoring device from thewell, a suitable fishing tool (not shown) is lowered into the tubingstring on a flexible line to engage the flange 127 at the upper end ofthe lock mandrel. An upward jarring blow is then delivered to v the lockmandrel through the pulling tool by the customary set of flexible lineoperated tools to which said running tool is attached to earn the detent136 out of the groove 135 and move the lock mandrel upwardly in thebody. As the lock mandrel moves upwardly, the flattened surfaces 131 onsaid mandrel are removed from between the internal lock surfaces of thekeys, whereby said keys are freed for inward movement. The projections126 of the keys which extend through the windows 125 of the mandrelengage the lower edges 143 of said windows to limit upward movement ofthe lock mandrel relative to said keys, so that further upward movementof the fishing tool and lock mandrel will cause the body 110 to moveupwardly. The upper beveled shoulders of the selector bosses and theguide bosses of the keys cam the keys inwardly to enable them to passany obstructions they may encounter during upward movement through thetubing string.

It will thus be apparent that a modified form of anchoring device hasbeen illustrated and described for positioning well tools in tubingstrings at a selected location therein and which includes a plurality ofselector and stop keys 112 biased for outward movement to positions forengagement with corresponding grooves of a landing nipple forming partof the tubing string, and an expander mandrel which is moved downwardlybetween the keys to a locking position to engage and hold said keys inexpanded positions, whereby the anchoring device is prevented frommovement in either upward or downward direction from the selectedlocation in the tubing string. It will further be seen that means hasbeen provided on the expander mandrel and on the body of the anchoringdevice for releasably holding said expander mandrel in position lockingthe keys in expanded locking position,

and that said expander mandrel may be moved upwardly from said lockingposition by the application of a sufficient force thereto. It willadditionally be seen that the expander mandrel is retained in lockingposition against accidental or undesired movement therefrom until suchupward force has been applied thereto.

The foregoing description of the invention is explanatory only, andchanges in the details of the constructions illustrated may be made bythose skilled in the art, within the scope of the appended claims,without departing from the spirit of the invention.

What is claimed and desired to be secured by Letters Patent is:

1. A well tool comprising: a carrier member including an outer tubularmember; a locking member mounted on said carrier member for lateralmovement between projecting locking and retracted non-locking positionsthereon; an elongate inner tubular member slidable longitudinally ofsaid carrier member and having a locking surface slidable within saidouter tubular member to engage with said locking member to hold saidlocking member in projecting locking position; said elongate innertubular member being slidable in said outer tubular member between aposition in which said locking surface is positioned to engage saidlocking member and a position wherein said locking surface is notengageable with said locking member; spaced shoulder means on saidcarrier member and said inner tubular member engageable with one anotherfor limiting movement of said inner tubular longitudinally of saidcarrier member to movement between said positions; restraining groovemeans on said inner tubular member and projecting latch means on saidcarrier member movable into engagement with each other to restrain saidinner tubular member against longitudinal movement with respect to saidcarrier member and in said position in which said locking member mountedon said carrier member for lateral movement between projecting lockingand retracted nonlocking positions thereon; an elongate inner tubularmember slidable longitudinally in said carrier member and engageablewith said locking member to hold said locking member in projectinglocking position; spaced shoulder means on said carrier member and saidtubular member engageable with one another for limiting movement of saidtubular member longitudinally of said carrier member; an external groovein said tubular member; and a resilient member on said carrier memberhaving inwardly projecting catch means thereon engageable in the groovein said tubular member to restrain said tubular member againstlongitudinal movement with respect to said carrier member and inposition engaging and holding said locking member in locking position.

3. A well tool comprising: an outer tubular member; a locking membermounted on said outer tubular member for lateral movement betweenprojecting locking and retracted non-locking positions thereon; anelongate inner tubular member slidable longitudinally in said outertubular member and engageable with said locking member to hold saidlocking member in locking position; spaced shoulder means on said outertubular member and said inner tubular member engageable with one anotherfor limiting movement of said inner tubular member longitudinally ofsaid outer tubular member; an external groove in said inner tubularmember; and a resilient member on said outer tubular member havinginwardly projecting catch means thereon engageable in the groove in saidinner tubular member to restrain said inner tubular member againstlongitudinal movement with respect to said outer tubular member and inposition engaging and holding said locking member in locking position;and packing means mounted exteriorly of said outer tubular member spacedfrom and operable independently of said locking member.

4. A well tool comprising: an elongate outer tubular member; a lockingmember carried by said tubular member for lateral movement betweenprojecting locking and retracted non-locking positions thereon; springmeans on said tubular member engaging said locking member and biasingsaid locking member toward projecting position; an inner member in saidtubular member slidable longitudinally of said tubular member and havingan external locking surface thereon engageable with said locking memberto hold said locking member in projecting locking position; spacedshoulder means on said inner member and said locking member engageablewith one another for limiting movement of said inner memberlongitudinally of said tubular member; and external groove means on saidinner member and internal projecting catch means on said tubular memberco-engageable for releasably holding said inner member againstlongitudinal movement with respect to said tubular member and inposition engaging and holding said locking member in locking position.

5. A well tool comprising: an elongate outer tubular member; a lockingmember carried by said outer tubular member for lateral movement betweenprojecting locking and retracted non-locking positions thereon; springmeans on said outer tubular member engaging said locking member andbiasing said locking member toward projecting position; an inner memberin said outer tubular member slidable longitudinally of said outertubular member between an upper position and a lower position therein;locking surfaces on said inner member and on said locking member, saidlocking surfaces being disengaged from one another to permit movement ofsaid locking member to non-locking position when said inner member is insaid upper position and being engaged with one another to hold saidlocking member in locking position when said inner member is in saidlower position; spaced shoulder means on said inner member and saidlocking member engageable with one another for limiting movement of saidinner member longitudinally of said outer tubular member; and internallyprojecting catch means on said tubular member and external groove meanson said inner member co-engageable when said inner meme ber is in saidlower position for restraining said inner member in said lower positionand with the locking surfaces on said sleeve member and on said lockingmember engaged holding said locking member in projecting lockingposition.

6. A well tool for use in a well string having means providing adownwardly facing lock shoulder and an upwardly facing stop shoulder,said tool including: a tubular outer carrier member; a plurality oflocking members on said tubular outer carrier member movable laterallywith respect to said tubular outer member between retracted andprojecting positions; an upwardly facing lock shoulder on each lockingmember engageable with said downwardly facing lock shoulder in said wellstring when said locking members are moved laterally outwardly relativeto said member to projecting position; an elongate inner tubular memberslidably disposed in said tubular outer member; means on said elongateinner tubular member movable longitudinally therewith to a lockingposition for engaging and holding said locking members in expandedposition to engage said downwardly facing lock shoulder to limit upwardmovement of said tool; external groove means on said elongate innertubular member and internal projecting means on said tubular outermember coengageable for restraining said inner member in lockingposition wherein said inner tubular member engages said locking membersto hold said locking members in projecting expanded locking position;and means on said tool engageable with said upwardly facing stopshoulder 10 of the well string for limiting downward movement of saidtool in said well string.

7. An anchoring device including: an elongate mandrel having a tubulardog holder mounted exteriorly thereof and concentric with thelongitudinal axis of said mandrel, said dog holder having a plurality oflongitudinally extending slots; a plurality of dogs carried by said dogholder and having outwardly extending bosses movable outwardly of saiddog holder through said slots; a dog expander slidably mounted on saidmandrel and having a locking portion movable with said mandrel betweensaid dogs to engage and hold said dogs in laterally projecting expandedpositions; cooperating means on said dog expander and said dog holderfor limiting upward movement of said dog expander relative to said dogholder; and shoulder means on said mandrel providing a downwardly facingstop shoulder adapted to engage an upwardly facing stop shoulder in awell flow conductor to stop downward movement of said mandrel therein;said dog expander being movable downwardly on the mandrel to move saidlocking portion on said dog expander and said dogs into cooperatingengagement with each other only after downward movement of said mandrelhas been stopped by said stop shoulder of said mandrel and while saidstop shoulder of said mandrel is so engaged with said stop shoulder ofsaid tubing; and internal projecting catch means on said dog holder andexternal groove means on said dog expander co-engageable when saidexpander is moved downwardly to position said locking portion betweensaid dogs for releasably locking said dog expander to said dog holder ina downward position wherein said dogs are held in expanded positions.

8. A well tool comprising: an elongate outer tubular member; a lockingmember carried by said tubular member for lateral movement betweenprojecting locking and retracted non-locking positions thereon; an innermember in said tubular member slidable longitudinally of said tubularmember between a first position and a second position therein; lockingsurfaces on said inner member and on said locking member, said lockingsurfaces being engageable with one another to hold said locking memberin locking position when said inner member is in said second positionand being disengaged from one another to permit movement of said lockingmember to non-locking position when said inner member is in said firstposition; spaced shoulder means on said inner member and said lockingmember engageable with one another for limiting movement of said innermember longitudinally of said tubular member to movement between saidfirst and second positions; external groove means on said inner memberand internal projecting catch means on said tubular member coengageableresiliently when said inner member is in said second position forrestraining said inner member against longitudinal movement with respectto said elongate tubular member and in said second position in saidtubular member; and means on said tubular member and said inner memberinitially releasably holding said inner member in said first position.

References Cited in the file of this patent UNITED STATES PATENTS2,153,812 Newton Apr. 11, 1939 2,401,119 Taylor May 28, 1946 2,687,775Baker Aug. 31, 1954 2,798,559 Fredd July 9, 1957 FOREIGN PATENTS 331,605Great Britain July 10, 1930

